What type of documents provide supplemental information within the Postal Service?

Handbooks are a key resource within the Postal Service as they offer comprehensive supplemental information on various policies, procedures, and operational guidelines. They serve as authoritative references that cover a wide range of topics relevant to postal employees, including customer service practices, employee conduct, workplace safety, and task-specific instructions.

While other options, such as guidelines, reports, and notices, may also provide important information, handbooks are specifically designed to be extensive resources that ensure standardized practices across the organization. They are regularly updated to reflect changes in procedures or regulations, making them crucial for employees seeking to understand the full scope of their responsibilities and the operational standards expected within the Postal Service.